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- W1992718346 abstract "Summary 1. To assess the influence of oviposition patterns on distributions of hydrobiosid caddisfly larvae, abundances of three hydrobiosid caddisfly species were estimated in whole reaches with and without suitable oviposition substrata along an upland temperate Australian stream. In addition, within‐reach spatial patterns were examined in relation to known oviposition locations as well as flow characteristics that corresponded to oviposition preferences. 2. Larval abundances in all samples were low relative to previous estimates of egg inputs into reaches. The presence of suitable oviposition substrata at a reach did not influence the abundances of larvae. For one species, benthic samples taken proximate to oviposition substrata revealed a sharp decline in abundance between first and later instars. Larvae of two taxa exhibited flow‐specific habitat preferences mirroring those described as important as cues for oviposition site selection. Previous estimates of egg mass aggregation were also reflected in similarly high levels of larval clumping; however, larval aggregation did not differ between reaches with and without oviposition sites. 3. Collectively, our results suggest that a large difference in the supply of potential recruits does not translate into marked differences in larval abundances of hydrobiosids at the reach level but may account for some variation in larval distribution within a reach and between instars. This evidence is consistent with the notion that (i) posthatching dispersal between reaches is substantial and (ii) mortality of larvae, particularly early instars, is high and (iii) within reach habitat preferences change with larval growth. 4. If adults are unable to lay eggs at reaches without suitable oviposition substrata, then reaches with oviposition substrata may be crucial as a source of recruits elsewhere. Furthermore, high mortality and/or dispersal among first instars signal this as an important part of the life history. Further data on the mortality and dispersal rates of newly hatched larvae would greatly benefit our understanding of the importance of local births in structuring patterns of abundance in stream invertebrates." @default.
- W1992718346 created "2016-06-24" @default.
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- W1992718346 date "2004-10-04" @default.
- W1992718346 modified "2023-10-15" @default.
- W1992718346 title "Relating larval distributions to patterns of oviposition: evidence from lotic hydrobiosid caddisflies" @default.
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- W1992718346 doi "https://doi.org/10.1111/j.1365-2427.2004.01278.x" @default.
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